In 1900, W.E.B. Du Bois (February 23, 1868–August 27, 1963) developed a special exhibition on the subject of sociology, with the intent to open the world’s eyes to what had been occupying him for nearly a decade — “the American Negro problem.”.
One type of graph he developed is known as the choropleth, a type of map which uses colors to show differences between the different units. For instance, this graph of Georgia counties shows how many Black people were living in each county. Below are two graphs, Du Bois' original, showing population in 1890, and my recreation, showing population in 2020.